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Because people eat (consume) with their eyes. The worst tasting food that looks great will taste better than the best looking food that looks like mud. There are exceptions, but you could classify fast food to retirement planners by that mantra; the best looking will be what you want.
You don't actually think you are going to get a Burger King burger that looks like what you see, but it will taste good, because it looks good. Marketing 201 maybe?
When those posters and picture concepts were being made, the game wasn't even close of being launched and thust they couldn't put anything without having the risk that its content might be different. By taking things (actors for example) that are clearly not inside the game as is, they remove any possible reason for people to be angry if the product didn't look like the poster.
Also, the fact that you mention that the style is similar from Saints Row 3 and 4 shows that it's a concept that can be recycled/reused and because it's not showing actual game content, but instead something "better" in quality, if SR4 was to get upgraded graphics or changed, it wouldn't have affected the marketing assets.
=Edit=
Also, I forgot to mention... Since there are prints and non-digital asset to be produce, using actors and high quality picture is actually cheaper than to uses the actual game asset. The game is made to render on a 72ppi screen while prints require 300dpi. In other words, unless they boost the resolution by over 3 times, the prints would have looked pixelised. True, on the screen as the things are moving around, you don't notice, but on still paper/cardboard, even 150dpi is noticable and blurry.
(Now, before some people mention that ppi (screen) is not the same as dpi(print), I do agree on the technical difference, but in terms of conversion, they are considered as of equal level. 1ppi = 1 pixel (per inch) made 3 gamma dots : Red, Green, Blue while 1 dpi = 1 dot (per inch) made of printed colored mini dots (mostly partially Cyan, Magenta, Yellow and/or Black unless some Pantone are used).
It's a common issues in the 3D that it's limited in quality. As a graphic designer which works (and got the diplomas to back it up) in both the 3D (modeling, animations and engine optimisation) as well as in any kind of print (been working as a print specialised graphic artist for over 6 years), I have gotten this question quite often about the required pixel sizes of a 3D image to be printed in mid-high formats. When they know the actual size required which sometimes range toward the dozen thousands of pixels, their jaw's dropping.)
(In example, for a 5 foot tall cardboard, you need to product a 18000 pixel high picture if you wish for it to be a 100% quality.)
As ironic as it might be, it's actually easier to photoshop an picture taken of a real person (or a ultra-high detailled CG character) than an actual game character because the concept can also be made HD without making the whole thing suffer.